feat: Tax route fix + Local Pickup + Email/Notifications settings

## 1. Fixed Tax Settings Route ✅
- Changed /settings/taxes → /settings/tax in nav tree
- Now matches App.tsx route
- Tax page now loads correctly

## 2. Advanced Local Pickup ✅
Frontend (LocalPickup.tsx):
- Add/edit/delete pickup locations
- Enable/disable locations
- Full address fields (street, city, state, postcode)
- Phone number and business hours
- Clean modal UI for adding locations

Backend (PickupLocationsController.php):
- GET /settings/pickup-locations
- POST /settings/pickup-locations (create)
- POST /settings/pickup-locations/:id (update)
- DELETE /settings/pickup-locations/:id
- POST /settings/pickup-locations/:id/toggle
- Stores in wp_options as array

## 3. Email/Notifications Settings ✅
Frontend (Notifications.tsx):
- List all WooCommerce emails
- Separate customer vs admin emails
- Enable/disable toggle for each email
- Show from name/email
- Link to WooCommerce for advanced config

Backend (EmailController.php):
- GET /settings/emails - List all emails
- POST /settings/emails/:id/toggle - Enable/disable
- Uses WC()->mailer()->get_emails()
- Auto-detects recipient type (customer/admin)

## Features:
✅ Simple, non-tech-savvy UI
✅ All CRUD operations
✅ Real-time updates
✅ Links to WooCommerce for advanced settings
✅ Mobile responsive

Next: Test all settings pages

includes/Api/Routes.php

@@ -11,6 +11,8 @@ use WooNooW\API\PaymentsController;
 use WooNooW\API\StoreController;
 use WooNooW\Api\ShippingController;
 use WooNooW\Api\TaxController;
+use WooNooW\Api\PickupLocationsController;
+use WooNooW\Api\EmailController;
 
 class Routes {
     public static function init() {
@@ -59,6 +61,14 @@ class Routes {
             // Tax controller
             $tax_controller = new TaxController();
             $tax_controller->register_routes();
+            
+            // Pickup locations controller
+            $pickup_controller = new PickupLocationsController();
+            $pickup_controller->register_routes();
+            
+            // Email controller
+            $email_controller = new EmailController();
+            $email_controller->register_routes();
         });
     }
 }